OFNA Racing OB4 RTR User Manual

RTR INSTRUCTION MANUAL

1:10 SCALE NITRO POWERED TOURING CAR

OFNA RACING 22692 GRANITE WAY, STE. B LAGUNA HILLS, CA. 92653 Tel: (949) 586-2910

SAFETY PRECAUTIONS

!

This radio control models is not a toy!

- First builders should seek advice from people having building experience in order to assemble the model correctly and to produce it's performance to full extent.

- Assemble this kit only in places out of children's reach!

- Take enough safety precautions prior to operating this model. You are responsible for this models assembly and safe operation!

- Always keep this instruction manual ready at hand for quick reference, even after completing the assembly.

*SPECIFICATION ARE SUBJECT TO CHANGE WITHOUT NOTICE.

REQUIRED FOR OPERATION

THINGS NEED BESIDES THE KIT

.12 OR .15 ENGINE

Glow Fuel

20%

Fuel Bottle # 10160 - large 16oz # 10161 - large Auto Stop # 10162 - small 8oz

Glow Plug Heat with Battery & Charger

# 10227....$$19.95

(please note OFNA Glow Heats available)

.12 RED HEAD ENGINE # 50121

FEATURES EXCELLENT POWER AT LOWER PRICE!

Note: The engine may not include in kit.

RADIO CONTROL UNIT

Note: Careful read the instruction manual of your 2 channel radio controller before using.

SUITABLE SERVO SIZE

-41mm

36mm

15mm - 21mm

29mm - 42mm

On-Road Starter Box # 10256 - 1/10 scale Starter Box # 10257 - 1/10 scale Starter Box w/ Panel Add-on # 92571 - Power Panel Glow Heater # 92572 - Cable for Glow Plug

Radio must be set at neutral position before installing in the kit.

SEQUENCE TO SET NEUTRAL

1111

12

13

12V Battery for Starter Box (must have)

AA Batteries ( 12 pcs ) for radio

Install AA batteries in Radio.

Extend the antenna.(Transmitter)

Install batteries into Car receiver .

After installing the battery, connect the battery box.

Extend the antenna. (Receiver)

Set the trim-leved at center.

Turn on the switch. (Transmitter)

Turn on the switch. (Receiver)

Make sure the servos are in command.

When the operation stick is in neutral, servo horns must be in neutral as will. *Adjustment can be made by re installing the servo horn.

Turn off the switch. (Receiver)

Turn off the switch. (Transmitter)

Retract the antenna. (Transmitter)

TOOLS NOT INCLUDED IN KIT

Cutter

Phillips Type Screw Drivers ( L )

Phillips Type Screw Drivers ( S )

Needle Nose Pliers

Knife

Curved Scissors

Precision Caliper

Brush

Cross Wrench # 17109

Instant Cemment

Masking Tape

Paints

Diff Oil Silicone

READ THIS BEFORE RUNNING

Running a nitro kit is fun and easy, but to make this a safe rusting. and good experience you must observe a few rules. This kit is extremely fast, easily over 40MPH, and can seriously injure someone if you are not careful.

Where to run car?

• Any running area you choose must be dry. Do not run car near any water.

• Do not run on public streets. It is very easy to have the car run over or damaged by hitting the curb.

• Do not operate car in tight confined places. The car is very fast and will easily hit something.

• Do not run near people or animals. and will too easily hit someone.

• Due noise, you will want to consider the surrounding area when operating the car.

• Do not operate the car at night. You will not be able to drive it without hitting something.

• Do not operate the car indoors. Engine exhaust is not healthy.

Glow Fuel

• Glow fuel is poisonous!

• Glow fuel is flammable!

• Do not leave in fuel bottle with lid off at any time. engine if left in tank.

• Don use any fuel other than glow fuel in this engine.

The car is very fast

• Clear oil and dirt from chassis with a degreaser.

Precautions

• Hot Parts - The pipe, manifold, engine and head are very hot and will cause burns.

• Rotating Parts - Keep hands away from the drive train, wheels, and engine when engine is running.

• Radio - Check batteries life before running the car. If radio does not have full control of the car with steering and/or throttle/brake do not run until corrected. Failure to correct this will result in possible injury and damage to the car or property.

• Glow fuel - Do leave the glow fuel unattended with the lid off. Fuel contains Methanol and Nitro Methane and is flammable and poisonous.

Store fuel in cool ventilated location. Refer the glow fuel label for additional precautions.

• Car Fuel tank - Never store fuel in car tank, it will ruin the

First Time Starting the Engine

Caution! When starting engine make sure the following is observed.

• Set engine Master needle to 3 turns (rich setting)

• Do not do this alone, get an experienced friend to help at first.

• Fill fuel tank, try not to spill fuel. Do not spill fuel on receiver

• Hold car off the ground, so it will not runaway when first starts

• Turn on Radio and check the leakage before starting engine.

• Turn on car receiver battery switch.

• Always have an air filter on the carburetor to keep dirt out.

Engine Break-in

• See Engine Page.

Emergency Stopping Engine When Running

• Remove air filter and cover carb. intake.

• Squeeze fuel line and hold until engine stops.

• With a rag, cover exhaust outlet.

Storing Car After Running

• Remove fuel from tank and fuel lines

• Turn off radio in car

• Put a few drops of after run in engine to keep it from

BAG

1

Step 1

1

PARTS USED

SHOCK ASSEMBLY

1

* The c-ring must fit into the groove.

37967 C-Ring

37751 2mm E-Ring

(1mm x1 Hole)

* Cut the piston the plastic parts tree.

from

#39020

3 x 30mm Shock Shaft x4

#37070 or 37967

O-Ring (blue) x8

#37751

2mm E-Ring x8

37080

Pressure Top x4

37070

37967

Washer

3mm O-Ring

(Black)

(2 pcs)

Oil

* Put a little oil onto the 3mm o-ring before assembly.

ASSEMBLY OF THE 4MM BALL END

2

* The O-Ring must be inserted into groove.

37966 P12 O-Ring

Oil

*Use a little shock oil to lubricate O-Rings before screwing on adjusting nut.

O-ring

37965 Shock Body, Fnt/Rr

37962 Adjust Nut (Blue)

37963 Adjust Nut (Purple)

37650 4mm Ball End

(Short)

39020 Shock Shaft

TIP * Use the 1.2mm x 2 hole piston for this kit. * 50wt silicone shock is suggested by racing team.

Make pair for front.

37100 Piston (1mm x 2 Holes)

37650 4mm Ball End

(Long)

• Use same shock body for front and rear units.

(1.2mm x2 Holes)

*Use pliers to snap on E-Ring.

Make pair for rear.

Long Short or or Rear Front

OPTION PARTS:

Hard (White)

Middle (Yellow)

Soft (Blue)

Stock Spring; #39010 pair

Optional Spring - 2 pair set 39315, white set 39316, blue set 39317, yellow set

39314, Spring Racer Pack 2 pair white, 2 pair blue, 2 pair yellow

FILLING THE SHOCK OIL

3

Shock Oil, Silicone

Oil

1mm

* Pull down piston and pour oil into shock cylinder. Remove air bubbles by slowly moving piston up and down.

37960 Shock Cap (Blue)

37961 Shock Cap (Purple)

37100 Ball End ( Large )

37080 Pressure Top

* Be careful not to damage the shock shaft.

( Front )

Shock Spring

37100 Spring Holder

* Take the spring holder the plastic parts tree.

Threaded Shock set 37958, blue 37959, purple

Shock Spring

37100 Spring Holder

from

( Rear )

BAG

2

4

~

Step 4-5

5

PARTS USED

FRONT DIFFERENTIAL ASSEMBLY

1.

*Snap E-Ring onto Diff. Cap Joint.

2mm E-Ring

2.

39431 Differential Cap Joint, Long

FRONT GEAR DIFF IS LONGER/WIDER THAN REAR

37773

Steel Ring x2

M2x10 Screw x4

37751

2mm E-Ring x2

37775

3mmx20mm Pin x1

37771

Bevel Gear 13T x2

37771 Bevel Gear 13T

39433 plastic Washer

39401 Front Diff. Case

37773

Steel Ring

39431 Differential Cap Join, longt

Notice the direction of the plastic washer.

39432 5x7x1mm O-Ring

Notice indent gear pocket, not for o-ring

TIP Grease all seals before installing for a better fit.

37773 Steel Ring

39433 plastic Washer

37771 Bevel Gear 13T

39432 5x7x1mm O-Ring

E-77

37776 35T Gear Diff Pulley

39432 5x7x1mm O-Ring

Notice the direction of the plastic washer.

37772

Bevel Gear 10T x2

39431

Differential Cap Joint, long x2

3.

37772

Bevel Gear 10T

Bevel Gear Assembly

39434 Gasket

*Put the gasket into groove.

37775

3mmx20mm Pin

37772

Bevel Gear 10T

E

S

A

E

R

G

SILICONE

OIL

4.

M2x10 Screw

2mm E-Ring

* PUT THE OIL INTO DIFF. CASE ABOUT 50%

USE THE SILICONE DIFF LOCK IN KIT, 30,000wtg.

50%

* CHECKING YOUR DIFFERENTIAL ASSEMBLY

To test the effectiveness of the gear differential hold the gear tightly with one hand and turn one cap joint. Does the other cap joint move in the opposite direction and smoothly? If gear differential does not smoothly, assemble the gear diff. once again

move

*Apply diff g grease to the

ear

differential, during assembly.

PARTS USED

5

REAR DIFFERENTIAL ASSEMBLY

37774 Differential Cap Joint

M2x10 Screw

37773

Steel Ring x2

M2x10 Screw x4

37751 2mm E-Ring x2

37775

3mmx20mm Pin x1

37771

Bevel Gear 13T x2

37772

Bevel Gear 10T x2

37772 Bevel Gear 10T

37771

Bevel Gear 13T

39402

35T Diff Pulley Case

37773

Steel Ring

39432 5x7x1mm O-Ring

37774

Differential Cap Joint

37775

3mmx20mm Pin

37772 Bevel Gear 10T

2mm E-Ring

37776

35T Diff Pulley

37771

Bevel Gear 13T

*Snap E-Ring onto Diff Cap Joint.

39432 5x7x1mm O-Ring

37773 Steel Ring

2mm E-Ring

39434 Gasket

GREASE

SILICONE OIL

*Apply diff g grease to the

ear

differential, during assembly.

37774

Differential Cap Joint, short x2

BAG

3

TIP Grease all seals before installing for a better fit.

~

6 15

Step 6~15

ASSEMBLY OF THE FRONT ARM BLOCK

6

39050 Front Belt Tension Adjuster

37450 10 x 15mm Ball bearing

39050 Front Arm Block ( Right )

* CHECKING YOUR DIFFERENTIAL ASSEMBLY

To test the effectiveness of the gear differential hold the gear tightly with one hand and turn one cap joint. Does the other cap joint move in the opposite direction and smoothly? If the gear differential does not smoothly, assemble the gear diff. once again

37450 10 x 15mm Ball bearing

39050 Front Belt Tension Adjuster

move

39050 Front Arm Block ( Left )

77

88

66

99

55

1010

44

33

22

11

1111

1212

1313

Tighter

7

8

6

9

5

10

4

3

2

1

11

12 13

Looser

8

6

9

10

11

12

13

* Both-side of the belt tension adjuster

5

4

must be place in the same position.

3

2

Position No.7or 8 is standard position.

1

77

ASSEMBLY OF THE FRONT ARM BLOCK

39050 Front Arm Block ( Right )

Important

*Notice the position of the differential.

OPTION PARTS: 39460 Front Ball Differential

39458 Complete, Front ball Diff. Assembly

39050 Front Arm Block

( Left )

OPTION PARTS: 34961 - Rear Ball Differential

37141 (S)

PARTS USED

3 x 10mm Flat Head Tapping Screw x4

37140 (S)

Short

OPTION PARTS: 39471 Alum. Suspension arm Block (Front)

ASSEMBLY OF THE FRONT BLOCK ONTO CHASSIS

88

* Insert the belt before assembly.

Long

37140 (L)

38140 384 Belt

Ball Diff Rebuild Parts:

37480 35T Pulley (Ball Type) 37110 Diff. Washer 37120 1/8" Ball (12 Pcs) 37130 1/16" Ball (9 Pcs) 37130 Diff Trust Washer 37140 Cap Joint, front (l/s) 37141 Cap Joint, rear (s/s) 35958 5x8mm Ballbearing 37131 2.6x4.5 Spring Washer 37131 2.6x25mm Screw

37141 (S)

3 x 10mm Flat Head Tapping Screw

39420 Chassis ( Hard Coated)

PARTS USED

39140

8mm Steering Ball x4

39150

10mm Hex Screw x4

ASSEMBLY OF THE FRONT KNUCKLE ARMS

99

39090

Front Knuckle Arm ( Left )

L

* "L" make for left-side.

39140

8mm Steering Ball

39141

8mm Steering Ball Washer

39150

10mm Hex Screw

* Make steering ball move smooth.

39090

Front Knuckle Arm ( Right)

5mm Hex Wrench

37450

10 x 15mm Ball Bearing x2

37430

5 x 11mm Ball Bearing x2

PARTS USED

ASSEMBLY OF THE CVA UNIVERSAL SHAFT

1010

37430

5 x 11mm Ball Bearing

37450

10 x 15mm Ball Bearing

CVA Joint Constant Velocity Axle

39190

CVA Joint Constant Velocity Axle

ASSEMBLYOF THE FRONT SUSPENSION ARMS

1111

39050 Front Upper Arm

39190

37450

10 x 15mm Ball Bearing

Assembly of the right and left-side are the same.

LL

37430

5 x 11mm Ball Bearing

Push

* Push ball bearings into

2

knuckle arm as shown.

Assembly of the right and left-side are the same.

* Notice the left and right-side arm is difference angle.

Push

37751

3 x8mm Set Screw x2

Leave approx 3mm

* A 3 x 8mm set screw is used to adjust the ride height.

• Lower arm down stop.

3 X 8mm Set Screw

39060 Front Lower Arm

( Right )

Front Knuckle Arm Assembly

LL

2 .5mm Hex Wrench

0 10 20 30 40 50

( Left )

Leave 2mm

mm

ASSEMBLY OF THE FRONT SUSPENSION ARM TO ARM BLOCK

1212

37360

4mm Ball Socket x2

37751

3 x 3mm Set Screw x4

38240 Lower Arm Shaft

Assembly of the right and left-side are the same.

39070 Upper Arm Shaft

LL

3 x 3mm Set Screw

* Set 3 x 3mm set screw in " D" cut.

PARTS USED

3 x 3mm Set Screw x2

OPTION PART: 39467 Alum. Stabilizer Mount

3 X 3mm Set Screw

ASSEMBLY OF THE FRONT STABILIZER

1313

3 x 3mm Set Screw

37360 4mm Ball & Socket

38090

1.6 x 35mm Stabilizer

LL

39060

Stabilizer Ball

* Insert the drive shaft before assembly.

3 X 3mm Set Screw

Assembly of the right and left-side are the same.

* Insert F-09B as shown.

38090

1.6 x 35mm Stabilizer

3 x 3mm Set Screw

* Set 3 x 3mm set screw in " D" cut.

39060

Stabilizer Mount

39060

Stabilizer Mount

39060

Stabilizer Ball Block

3 x 3mm Set Screw

ASSEMBLY OF THE FRONT STABILIZER

1414

TO ARM BLOCK

39417 Front Lower Arm Stiffener

3 x 15mm Screw x2

39060

Stabilizer Cam Adjuster

3 x 15mm Screw

39090 Caster Angle Adjuster

6

2mm

* o change

use adjuster t

the caster angle .

1mm

LL

* Cut the shared plastic before assembly.

OPTION PARTS: 39411 Alum. Front Stabilizer Mount

ASSEMBLY OF THE FRONT BUMPER

1515

39406 Front Bumper

3 x 10mm Flat Head Tapping Screw x2

3mm Nylon Nut x1

3 x 15mm Screw

3mm Nylon Nut

* Cut the shared plastic before assembly.

39060 Stabilizer Cam Adjuster

* Turn stabilizer balance adjuster to adjust the stabilizer to the same angle.

LL

* Keep stabilizer ball in the center.

3 x 10 mm Flat Head Screw x1

3 x 10mm Flat Head Tapping Screw

3 x 10mm Flat Head Screw

3 x 10mm Flat Head Tapping Screw

LL

ASSEMBLY OF THE FRONT SHOCK TOWER

1616

39422 Front Alum. Black Shock tower

3x10mm Tapping Screw

3x10mm

* Notice the front tower and rear tower are not the same.

Tapping Screw

3 x 10mm Tapping Screw x2

LL

BAG

171723

Step 17~23

4

PARTS USED

39140

8mm Steering Ball x4

39150

10mm Hex Screw x4

37450

10 x 15mm Ball Bearing x2

ASSEMBLY OF THE REAR WHEEL HUB

* Make 2 rear wheel hubs for left and right hand- side.

5mm Hex Wrench

39150

10mm Hex Screw

39141 8mm Steering Ball Washer

39140 8mm Steering Ball

39100

37430

5 x 11mm Ball Bearing

Rear Wheel Hub

39100 Rear Wheel Hub

39140 8mm Steering Ball

39130 Rear Wheel Axle Shaft

39150 10mm

Hex Screw

* keep 8mm steering ball smooth.

39141 8mm Steering Ball Washer

37430

5 x 11mm Ball Bearing x2

39130 Rear Wheel Axle Shaft x2

* Push ball bearing into rear hub as shown.

37450 5 x 11mm

Ball Bearing

PushPush

37450 5 x 11mm Ball Bearing

39130 Rear Wheel Axle Shaft

37430 5 x 11mm Ball Bearing

PARTS USED

37751

3 x8mm Set Screw x2

37360

4mm Ball Socket x2

ASSEMBLY OF THE REAR HUBS INTO REAR ARMS

18

3 x 8mm Set Screw

39060 Rear Lower Arm

37360 4mm Ball & Scoket

* Note direction of the arms.

* Use this hole for 37360

Assembly of the right and left-side are the same.

2mm

PARTS USED

Leave approx 4mm

* A 3 x 8mm set screw is used to adjust the ride height.

VERY IMPORTANT!

39110 Rear Block ( Right )

ASSEMBLY OF THE REAR DIFFERENTIAL INTO

18

REAR BLOCK

37450 10 x 15mm Ball Bearing

3905 Belt Tensioner

2 .5mm Hex Wrench

0 10 20 30 40 50

39110 Rear Block ( Left )

37450 10 x 15mm Ball Bearing

mm

37450

10 x 15mm Ball Bearing x2

OPTION PARTS: 39472 Alum. Susp. Block ( Rear )

39415 Rear Diff. Adapter

39415 Rear Diff.

( R )

7

8

6

9

5

4

3

2

1

* Both the left and right hand belt tension adjuster must be place in same position. N0.3 is standard position.

10

11

12 13

3

Looser

2

1

7

8

6

9

5

10

4

11

Tighter

12

13

( L )

12

13

7

8

6

9

5

10

4

11

3

2

1

Adapter

( Back View )

* Check the position of the ball differential before assembly.

PARTS USED

3 x 10mm Tapping Screw x2

ASSEMBLY REAR BLOCK COVER AND

19

REAR LOWER ARMS

39319 150 Belt (Rear)

3 x 10mm Tapping Screw

OPTION PARTS: 39468 Alum. Rear Block Cover

3 x 3mm Set Screw x2

38240 rear lower arm shaft

* Insert rear belt before assembly.

Assembly of the right and left-side are the same.

3 x 3mm Set Screw

39414 Rear Block Cover ( Bigger )

* Set the 3x3mm set screw in "D" cut.

3 x 15mm Flat Head Tapping Screw x5

3 x 15mm Flat Head Tapping Screw